Enchantment Preservation

This mod adds stones you can add to your equipment. They then store enchantments you put on that equipment (up to a certain configurable number) and drop, when the tool breaks, so you can add them to a different tool.

You can also make it so equipment is only enchantable, if it has a stone attached.

!enchanting tool with stone image

Rad233 made some alternate textures, which you can find here.